Smoke-preventing furnace.



No. 663.!49. Patented Dec. 4, I900. G. F. BONNER.

SMOKE PREVENTING FURNACE.

(No Model.)

m H. W I II 47!!! I l I Wihwogco NrTn STATES PATENT FFICE.

SMOKE-PREVENTING FURNACE.

SPECIFICATION forming part of Letters Patent No. 663,149, datedDecember 4, 1900.

Application filed March 1, 1900. Serial No. 6,972. (No model.)

To all whom it may concern:

Be it known that I, Gnonen F. OoNNER, a citizen of the United States, residing at Port Huron, in the county of St. Clair and State of Michigan, haveinvented certain new and useful Improvements in Smoke-Preventing Furn aces, of which'the following is a specification.

This invention relates to an improvement in smoke-preventing furnaces for boilers and the like; and it is embodied in the construction and arrangement of parts hereinafter described, and pointed out in the claim.

The invention relates more particularly to that class of smoke preventing furnaces wherein air is injected into the furnace above the grates.

The invention relates more particularly to the special construction and arrangement of means for introducing the air and the constructi on of the grate member of the furnace.

In the drawings I have shown the construction embodying the invention, but desire it understood that various modifications and changes can be made without departing from the nature-and principle of the invention.

In the drawings, Figure 1 represents a longitudinal vertical sectional View of a furnace containing the improvements. Fig. 2 is a cross-section of the same.

A designates the side walls of a casing converging inwardly at their upper ends, adapted to abut against the bottom portion of the boiler, so as to leave a longitudinally-disposed uninterrupted combustion-chamber between the same and the grate, to be hereinafter designated.

0 represents a grate supported in any convenient or usual manner. This grate is divided in two sections occupying spaces between the side walls and center, leaving a centrally-unoccupied space and an unoccupied space at the outer edges. At the opposite sides of the grates are rigidly secured upright partitions D, the same extending from a point below the surface of the grates upwardly to a point a considerable distance above the same, the space between the partition and side walls communicating with the ash-pits or the source of the air-supply through suitable openings between the grate-sup ports 0.

At the center of the furnace between the two grates is a frame E, formed of two sepa rated plates e, thereby forming a free passage-way between the plates. This frame rests on the grate-supporting bars and extends upward above the grates, so that a free circulation of air is had, which is passed up between the grates and discharged into the center of the combustion zone of the furnace. The plates above referred to extend longitudinally the entire length of the furnace,and the outer plates are held in position conveniently either with the side walls or by having flanged lower ends, as shown.

In operation air entering through the ashpit or other suitable source will pass through the unobstructed air spaces or flues between the respective plates at the center and plates and side walls at the sides and be ejected in thin sheets upwardly above the air-flues into the combustion chamber intermediate the converged sides of the casing and directly beneath the boiler, as clearly shown in the drawings. In this manner the air is discharged at a proper point to intermingle with the heated unconsumed gases in the combustion-chamber, thus supplying a suificient amount of oxygen to consume completely the unconsumed gases. It will also be seen that by the air passing upward adjacent to the side walls the side walls at the point where the grate is located are kept cool and are prevented largely from burning out. By introducing the air in thin sheets the whole length of the furnace I find it more easily mixes with the gases and more perfectly than in other types of furnaces of this character.

Another advantage of my construction is that the air as it enters is more or less heated before it issues from the passages into the combustion-chamber.

It is to be understood that the plates may be of any desired material, such as fire brick or clay, or they may be of cast-iron.

Having thus described the invention, what I claim as new, and desire to secureby Letters Patent, is

In a boiler-furnace, the combination with the boiler, of a casing therefor having inwardly-converging side walls abutting against the bottom portion thereof so as to leave a longitudinally-disposed uninterrupted combustion-chamber therebeneath, grates losated below the combustion-chamber, an airabove the airflues into the combustionchaniinlet below the grates, and longitudinally-dis ber, substantially as described. 10 posed plates extending the entire length of In testimony whereof I have affixed my sigthe furnace properly spaced apart to form nature in presence of two witnesses.

5 through unobstructed air flues extending GEORGE F. OONNER.

from a plane below to a plane above the relVitnesses:

spective planes of the grates, whereby thin S. A. WOOD, sheets of air are caused to eject upwardly H. B. HOYT. 

